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About our Sun...
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My teacher said that Sun is a star and it can die. Is that right? If yes, how long it will be last? And when the Sun is die that mean that is the End Of The World????
-sine ira et studio-
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Re: About our Sun...
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In about 6 billion years the sun will have become a red giant and have enveloped mercury and venus, leaving earth so close that it becomes a ball of magma. After that I think it becomes a dwarf star but I'm not sure, it might just explode. But yes, it will eventually go out.
Wise Man says: "Take a dog off its leash and it will wander."
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Re: About our Sun...
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by MiCHiYo μ
on 2006-08-09 17:22:33
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righ on, bro. according to the stuff that's i've learnt, the sun is already quite old. in the "near" future (well, near for the sun but not for us), it will explode and create a black hole, sucking all planets into it. it WILL eventually go out, but it will kill humankind with heat first, just like what engineer said. -michiyo- 
 beware. the QueeN oF SiGGieS is here. kill that mr. scrolly or your siggy goes BAI BAI. it's solidarity month! let's be united! +[-- GeNDouNiaNS: i am half-back! visit my blog by clicking on the siggie banner! updated: 12.07.07 --]+
~*..:: i'm never going to give up... if i do, then it wasn't worth trying. ::..*~
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Re: About our Sun...
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Yeah, we have 6 billion years to get out of here, and at the rate that technology is developing, we'd probably be able to move the whole planet to safety by then, both the people and the planet itself. I think we're good, as long as we don't blow ourselves up first .
10 more years!
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Re: About our Sun...
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Wow, im really a frog in the well... :/ this is the 1st time i heard about this.... |
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Re: About our Sun...
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It was one of the side pictures in my grade 7 science text. It was a picture of the earth all covered in magma. Its about the only thing I remember from that book.
Wise Man says: "Take a dog off its leash and it will wander."
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Re: About our Sun...
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by HongyNgyWongy
on 2006-08-11 17:56:15
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The sun will die... in a couple billion years... you will live... dont worry... When the sun dies... Every living thing will die. Reason: 1) most likely the explosion will reach earth, and burn everything. If Earth doesnt burn, 1) Everything will get scorched to ashes due to the supernova... Very bright... Worse than magnifying the sunlight... 2) when the sun dies out, no light for earth => no energy for plants => no plants => no energy can be created Perhaps people will live, cause of technology, and learning to adapt to things. Who knows. it will happen. Thats pretty much it. it will take a few billion years to reform a new star after the sun explodes, IF a black hole isnt created.
Busy playing games
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Re: About our Sun...
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by
on 2006-08-11 19:29:27 |
our sun is far too puny to go supernova! 
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Re: About our Sun...
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by MiCHiYo μ
on 2006-08-12 05:33:19
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[LaUgHiNg OuT lOuD] sorry... can't help it. i thought the sun was GIGANTIC!! how can it be puny? you mean for the size of a star? *scratches head* but, yeah, not all massive death explosions created by stars turn into black holes, but i doubt that people will still live in this planet, considering that our planet is third form the sun. maybe if humankind finally decides to move to pluto or something, as long as it's not mars... or jupiter... or uranus...
beware. the QueeN oF SiGGieS is here. kill that mr. scrolly or your siggy goes BAI BAI. it's solidarity month! let's be united! +[-- GeNDouNiaNS: i am half-back! visit my blog by clicking on the siggie banner! updated: 12.07.07 --]+
~*..:: i'm never going to give up... if i do, then it wasn't worth trying. ::..*~
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Re: About our Sun...
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Simply put, the wiki for stars will tell you everything you need to know. http://en.wikipedia.org/wiki/Stars But I'll address some of the things mentioned already using info from the wiki. Issue # 1: "In about 6 billion years the sun will have become a red giant and have enveloped mercury and venus, leaving earth so close that it becomes a ball of magma. After that I think it becomes a dwarf star but I'm not sure, it might just explode." For one, as the star loses mass due to that little bit of energy lost during its hydrogen to helium reactions(light, heat, other wavelengths of energy, etc), its overall gravity will decrease. Thus, "As most stars exhaust their supply of hydrogen, their outer layers expand and cool to form a red giant. In about 5 billion years, when the Sun is a red giant, it will be so large that it will consume Mercury and Venus. Models predict that the Sun will expand out to about 99% of the distance to the Earth's present orbit (1 astronomical unit, or AU). However by that time the orbit of the Earth will expand to about 1.7 AUs due to mass loss by the Sun. Our planet will thus escape envelopment." That's a moot point anyway, as technology should have developed to the point where humanity could avert extinction and find another near to main sequence star. If not, they're all stupid. Issue # 2: "in the "near" future (well, near for the sun but not for us), it will explode and create a black hole, sucking all planets into it" Our sun is a fairly medium sized star. Thus, this is what would happen. "An average-size star (less than 1.4 solar masses after explosion) will then shed its outer layers as a planetary nebula. In larger stars, defined as having more than 1.4 solar masses after explosion, fusion continues until an iron core accumulates that is too large to be supported by electron degeneracy pressure. This core will suddenly collapse as its electrons are driven into its protons, forming neutrons and neutrinos in a burst of inverse beta decay. The shockwave formed by this sudden collapse causes the rest of the star to explode in a supernova. Supernovae are so bright that they may briefly outshine the star's entire home galaxy. Eventually, most of the matter in a star is blown away by the supernovae explosion and what remains will be a neutron star (sometimes a pulsar or X-ray burster) or, in the case of the largest stars (more than 3 solar masses after explosion), a black hole." Besides, we still have 4+ billion years before our star actually starts to change. Hopefully it's understandable and not too long. Read the entire article if you want to know anything else though. Michiyo is somewhat right, as people in the future would either have to develop ways to support the food chain without the sun, if they stayed on earth. Though mars is technically the only planet besides pluto that could support a human population through methods to be developed in the future(Mercury and Venus might have supported life, if not vaporized by the sun). |
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Re: About our Sun...
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by
on 2006-08-17 04:05:33 |
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another question related to our sun... is it true that the sun's true mass(or weight?)is unknown? because if you want to get its mass/weight ya have to look for another planet or thing that is more massive and big than the sun? to use it in the formula: F=GMm/d2??? sorry for that confusing question. ;p |
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Re: About our Sun...
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No it is known, they built a probe that can withstand 15 000 000 degrees of heat and sent it to the center of the sun. Why they didn't send one into the Earth to see how the plates move and to look for diamonds is beyond me... JK The sun is too hot. The true mass of the sun can only be guessed at.
Wise Man says: "Take a dog off its leash and it will wander."
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Re: About our Sun...
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by HongyNgyWongy
on 2006-08-17 19:50:25
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mass... hm... really... cant be that heavy compared to its size... its only composed of hydrogen and helium, but in mass numbers. but it is much like jupiter, it has a core like jupiters, and its surrounding isnt hard, you would sink if you steped on it... if you dont burn =P
Busy playing games
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Re: About our Sun...
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by
on 2006-08-17 20:26:47 |
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The sun actualy acounts for about 98% of our solar systems mass, but it's density is is about 1.410gm/cm3 (~1.5 dense as water). So technicaly most people would float, if they survived the heat. The sun realy doesn't have a "solid" core, at least not until it's final stages of life in which Iron is produced by fusion, at which point there is no longer enough pressure to cause the iron to fuse. Then you could say the sun has a "solid" core, albeit a very hot core. You can make a gross estimation of the sun's mass simply by looking at what elements make up the sun. After that you simply figure in the volume of the sun and multiply. Of course that's all well and good, but it is a lot simpler to use the gravity formula as produced by gemmy_adik. shorasli, as gendou himself said "our sun is far too puny to go supernova!" The most we can hope from for our star is that as the sun sheds it's layers of gasses it blows away all the gasses from Jupiter, Saturn, Neptune, Uranus. After which we will be left with a smoledering pile of iron and a lot of whispy material floating arround what was once our solar system. Upon which the sun would take around 1 trillion years to fully cool from a white dwarf. A star along the lines of a super red giant would yield one of those more interesting aspects of stellar activity. Our star would need many times the ammount of mass it currently has to even come close to forming a black hole. |
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Re: About our Sun...
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by MiCHiYo μ
on 2006-08-24 17:59:24
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i have a follow up question to that... if, in 1 trillion years, our star turns into a dwarf, it's supposed to become cooler and change its colour, right? so, does that mean it won't be giving enough heat, energy, and light for humans to live on earth... or mars? -michiyo-
beware. the QueeN oF SiGGieS is here. kill that mr. scrolly or your siggy goes BAI BAI. it's solidarity month! let's be united! +[-- GeNDouNiaNS: i am half-back! visit my blog by clicking on the siggie banner! updated: 12.07.07 --]+
~*..:: i'm never going to give up... if i do, then it wasn't worth trying. ::..*~
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Re: About our Sun...
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A white dwarf star is the equivalent of smouldering ash, it has very little heat in comparison to a burning log. The amount of light that the sun gives off is what really matters. Our planet is heated by IR light, so if our planet gets no light then it will get very cold.
Wise Man says: "Take a dog off its leash and it will wander."
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Re: About our Sun...
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by
on 2006-08-27 19:02:16 |
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Not quite engineer, white dwarfs are actually hotter than an average star. They are usualy composed of iron and in some rare cases can exceed surface temperatures of 50,000 K; about 8 times hotter than the surface of the sun. All that heat however will have a bit of trouble reaching our planet due to the difference in surface area, energy released, form of that energy. Our star prmarily gives out the E.M. wavelengths of visible light focusing in the reds and yellows, and a lot of heat energy. While a dwarf star gives out enegy in the form of heat, and little in wavelengths of light depending on temperature: violet/white-hottest Red/brown-coolest. The difference is the ammount of surface area. The sun has many times the surface area of a dwarf meaning while its surface is technically cooler it radiates much more heat, thusly we have a warm-ish planet. |
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Re: About our Sun...
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No, actually the sun's surface area doesn't relly matter, sunlight does heat the planet. 2 processes are involved: insolation (as in sun) and the greenhouse effect. The sun emits the visible and invisible radiation (light) towards Earth. It hits Earth and warms the ground and air in that area, then it is reflected back into the atmoshpere. This process is known as insolation. It doesn't end there though. Clouds and water vapour (and also the greenhouse gases) absorb the IR and re-emit it in all directions. This process keeps the Earth's temperature fairly constant. This is known as the greenhouse effect. They learned me that in Geography, and I plan to major in it. BTW, I don't know what I was thinking. I knew the dwarf star is the hottest, but I didn't express it properly. My bad!
Wise Man says: "Take a dog off its leash and it will wander."
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Re: About our Sun...
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by MiCHiYo μ
on 2006-08-29 19:07:17
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so, okay. you mean, when the sun becomes colder --- turns into a red giant, and not a little white dwarf --- there will be less radiation heating up the earth (like less radiation heating up a bowl of soup in the microwave oven), which will make the greenhouse effect less effective, which just might as well kill the human beings because of the decrease in temperature. did i get that right? ^_^ BTW, i'm taking up geography now. and physics. darn. cool subjects, but hard to digest because i'm a newbie in IB. >_< -michiyo-
beware. the QueeN oF SiGGieS is here. kill that mr. scrolly or your siggy goes BAI BAI. it's solidarity month! let's be united! +[-- GeNDouNiaNS: i am half-back! visit my blog by clicking on the siggie banner! updated: 12.07.07 --]+
~*..:: i'm never going to give up... if i do, then it wasn't worth trying. ::..*~
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Re: About our Sun...
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by
on 2006-08-29 20:19:31 |
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Engineeer, I learned that stuff too. I don't deny that it helps keep the planet warm, but I'm reffering to why our planet gets that radiation in the first place. After all if it wern't for all that lovely insolation and what not it'd get really cold and really hot; much like mercury. michiyo, exactly like a bowl of soup in the microwave. If you set the power level on high and don't cover your food it will burn the surfaces and leave the unexposed parts cold, or set it really low and put something that keeps what little you get in there and you don't do much. Set it on medium and cover it and you can cook it compleatly. |
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